ML102360283

Fire Protection Program, Commitment to Provide Additional Information on Multiple Spurious Operation Scenarios

ML102360283
Person / Time
Site:	Watts Bar
Issue date:	08/20/2010
From:	Bajestani M Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC ME0853
Download: ML102360283 (4)

Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 August 20, 2010 10 CFR 50.4 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Stop: OWFN P1-35 Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit NRC Docket No. 50-391

Subject:

WATTS BAR NUCLEAR PLANT (WBN) UNIT 2 - FIRE PROTECTION PROGRAM (TAC NO. ME0853) - COMMITMENT TO PROVIDE ADDITIONAL INFORMATION ON MULTIPLE SPURIOUS OPERATION (MSO) SCENARIOS

Reference:

TVA letter dated July 16, 2010, 'Watts Bar Nuclear Plant, Unit 2 - Request for Additional Information Regarding Fire Protection Program (TAC NO. ME0853)"

The purpose of this letter is to provide the document that TVA committed in the referenced letter to send to NRC in support of its review of the Fire Protection Program for WBN Unit 2.

Specifically, in regard to TVA's review of MSO scenarios that could affect post-fire safe shutdown, NRC requested TVA to provide:

"A description of each of the scenarios identified by the analysis, including how post-fire safe shutdown is ensured for each scenario" The description of each scenario identified by the analysis was provided in Enclosure 1 of the referenced letter. Enclosure 1 of this letter contains the WBN Unit 2 Multiple Spurious Operation Evaluation, which provides a description of how safe shutdown is ensured for each of the MSO scenarios.

U.S. Nuclear Regulatory Commission Page 2 August 20, 2010 The resolutions contained in Appendix B of the MSO Evaluation Report shall be implemented prior to Unit 2 fuel load. Enclosure 2 provides the new regulatory commitments contained in this letter. The resolutions in Appendix C of the MSO Evaluation Report address Unit 1/

Common equipment and will be implemented by Unit 1 under the timing requirements prescribed by Enforcement Guidance Memorandum EGM-09-002 issued May 2009.

If you have any questions, please contact William Crouch at (423) 365-2004.

I declare under the penalty of perjury that the foregoing is true and correct. Executed on the 2 0 th day of August, 2010.

Sincerely, Masoud B jnstaI Watts B nit 2 Vice President

Enclosures:

1. WBN Unit 2 Multiple Spurious Operation Evaluation, Report R1976-20-01, dated August 2010

2. Regulatory Commitments cc (Enclosures):

U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381

U.S. Nuclear Regulatory Commission Page 3 August 20, 2010 bcc (Enclosures):

Stephen Campbell U.S. Nuclear Regulatory Commission MS 08H4A One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Patrick D. Milano, Senior Project Manager U.S. Nuclear Regulatory Commission MS 08H4 One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Loren R. Plisco, Deputy Regional Administrator for Construction U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257

ENCLOSURE 2 TVA LETTER DATED AUGUST 20, 2010 WATTS BAR NUCLEAR PLANT (WBN) UNIT 2 - FIRE PROTECTION PROGRAM (TAC NO. ME0853) - COMMITMENT TO PROVIDE ADDITIONAL INFORMATION ON MULTIPLE SPURIOUS OPERATION (MSO) SCENARIOS REGULATORY COMMITMENTS

1. The resolutions contained in Appendix B of the MSO Evaluation Report shall be implemented prior to Unit 2 fuel load.

2. PWROG Scenario 13a: "Charging Pump Runout" shall be confirmed to be within the bounds of CCP operation during the large break LOCA analysis prior to Unit 2 fuel load.